I've never had any issue with our redirect when we had a VCTF server. We ran both the game server and the redirect web server on Linux or Windows (or a mix and match). Never had an issue. The game server on Linux had its own issues but it's unrelated to the redirect.

I'd check the web server logs to see if you're even getting requests from clients for VCTF maps. If you're getting requests then it's probably not a game server config issue. The maps are much larger than regular DM or CTF maps so they will take longer to download but I assume you already considered that.

I remember your name in VCTF back in the day. I guess I'll load the game up when I get a chance!